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1 CHICAGO JOHN M. OLIN LAW & ECONOMICS WORKING PAPER NO. 41 (2D SERIES) Crime, Deterrence, and Right-to-Carry Concealed Handguns John R. Lott., Jr. and David B. Mustard THE LAW SCHOOL THE UNIVERSITY OF CHICAGO This paper can be downloaded without charge at: The Chicago Working Paper Series Index:

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3 Crime, Deterrence, and Right-to-Carry Concealed Handguns John R. Lott, Jr. and David B. Mustard 1 Abstract Using cross-sectional time-series data for U.S. counties from 1977 to 1992, we find that allowing citizens to carry concealed weapons deters violent crimes and it appears to produce no increase in accidental deaths. If those states which did not have right-to-carry concealed gun provisions had adopted them in 1992, approximately 1,570 murders; 4,177 rapes; and over 60,000 aggravate assaults would have been avoided yearly. On the other hand, consistent with the notion of criminals responding to incentives, we find criminals substituting into property crimes involving stealth and where the probabilities of contact between the criminal and the victim are minimal. The largest population counties where the deterrence effect on violent crimes is greatest are where the substitution effect into property crimes is highest. Concealed handguns also have their greatest deterrent effect in the highest crime counties. Higher arrest and conviction rates consistently and dramatically reduce the crime rate. Consistent with other recent work (Lott, 1992b), the results imply that increasing the arrest rate, independent of the probability of eventual conviction, imposes a significant penalty on criminals. The estimated annual gain from allowing concealed handguns is at least $6.214 billion. I. Introduction Will allowing concealed handguns make it likely that otherwise law abiding citizens will harm each other? Or, will the threat of citizens carrying weapons primarily deter criminals? To some, the logic is fairly straightforward. Philip Cook argues that, If you introduce a gun into a violent encounter, it increases the chance that someone will die. 2 A large number of murders may arise from unintentional fits of rage that are quickly regretted, and simply keeping guns out of people s reach would prevent deaths. 3 Using the National Crime Victimization Survey (NCVS), Cook further states that each year there are only 1 The authors would like to thank Gary Becker, Phil Cook, Clayton Cramer, Gertrud Fremling, Ed Glaeser, Hide Ichimura, Don Kates, Gary Kleck, David Kopel, William Landes, David McDowall, Derek Neal, and Dan Polsby and the seminar participants at the Cato Institute, University of Chicago, American Law and Economics Association Meetings, and the Western Economic Association Meetings for their unusually helpful comments. 2 Editorial, The Cincinnati Enquirer, 23 Jan 1996, A8. 3 See P.J. Cook, The Role of Firearms in Violent Crime, in M.E. Wolfgang and N.A. Werner, eds., Criminal Violence (Sage Publishers, 1982) and Franklin Zimring, The Medium is the Message: Firearm Caliber as a Determinant of Death from Assault, Journal Legal Studies, 1 (1972) for these arguments.

4 2 Chicago Working Paper in Law & Economics 80,000 to 82,000 defensive uses of guns during assaults, robberies, and household burglaries. 4 By contrast, other surveys imply that private firearms may be used in self-defense up to two and a half million times each year, with 400,000 of these defenders believing that using the gun almost certainly saved a life. 5 With total firearm deaths from homicides and accidents equaling 19,187 in 1991, 6 the Kleck and Gertz numbers, even if wrong by a very large factor, suggest that defensive gun use on net saved lives. While cases like the 1992 incident where a Japanese student was shot on his way to a Halloween party in Louisiana make international headlines, 7 they are rare. In another highly publicized case, a Dallas resident recently became the only Texas resident so far charged with using a permitted concealed weapon in a fatal shooting. 8 Yet, in neither case was the shooting found to be unlawful. 9 The 4 P.J. Cook, The Technology of Personal Violence, 14 Crime & Justice: Annl. Rev. Research 57, 56 at n. 4 (1991). It is very easy to find people arguing that concealed handguns will have no deterrence effect. H. Richard Uviller, Virtual Justice 95 (1996) writes that, More handguns lawfully in civilian hands will not reduce deaths from bullets and cannot stop the predators from enforcing their criminal demands and expressing their lethal purposes with the most effective tool they can get their hands on. 5 Gary Kleck and Marc Gertz, Armed Resistance to Crime: The Prevalence and Nature of Self- Defense with a Gun, 86 J. Crim. L. & Criminology 150, 153, 180, (Fall 1995). Kleck and Gertz s survey of 10 other nationwide polls implies a range of 764,036 to 3,609,682 defensive uses of guns per year. Recent evidence confirms other numbers from Kleck and Gertz s study. For example, Annest et. al. estimate that 99,025 people sought medical treatment for nonfatal firearm woundings. When one considers that many criminals will not seek treatment for wounds and that not all wounds require medical treatment, Kleck and Gertz s estimates of 200,000 woundings seems somewhat plausible, though even Kleck and Gertz believe that this is undoubtedly too high given the very high level of marksmanship that this implies by those shooting the guns. Yet, even if the true number of times that criminals are wounded is much smaller, it still implies that criminals face a very real expected cost from attacking armed civilians. See J.L. Annest, J.A. Mercy, D.R. Gibson, and G.W. Ryan, National Estimates of Nonfatal Firearm-related Injuries: Beyond the Tip of the Iceberg, Journal of the American Medical Association (June 14, 1995) and also Lawrence Southwick, Jr., Self-defense with Guns: The Consequences, (Working Paper, SUNY Buffalo 1996) for a discussion on the defensive uses of guns. 6 Statistical Abstract of the United States (1995). 7 Japan Economic Newswire, U.S. jury clears man who shot Japanese student, Kyodo News Service (24 May 1993) and Lori Sharn, Violence shoots holes in USA s tourist image, USA TODAY (9 Sept 1993), 2A. 8 Dawn Lewis of Texans Against Gun Violence provided a typical reaction from gun control advocates to the grand jury decision not to charge Gordon Hale. She said, "We are appalled. This law is doing what we expected, causing senseless death." Mark Potok, Texan says gun law saved his life. I did what I thought I had to do', USA TODAY, 22 Mar 1996, 3A. For a more recent evaluation of the Texas experience see Few Problems Reported After Allowing Concealed Handguns, Officers Say, Fort Worth Star-Telegram, (16 July 1996). By the end of June 1996, more than 82,000 permits had been issued in Texas. 9 In fact, police accidentally killed 330 innocent individuals in 1993, compared to the mere 30 innocent people accidentally killed by private citizens who mistakenly believed the victim was an

5 Concealed Handguns 3 rarity of these incidents is reflected in Florida statistics: 221,443 licenses were issued between October 1, 1987 and April 30, 1994, but only 18 crimes involving firearms were committed by those with licenses. 10 While a statewide breakdown on the nature of those crimes is not available, Dade county records indicate that four crimes involving a permitted handgun took place there between September 1987 and August 1992 and none of those cases resulted in injury. 11 The potential defensive nature of guns is indicated by the different rates of so-called hot burglaries, where residents are at home when the criminals strike. 12 Almost half the burglaries in Canada and Britain, which have tough gun control laws, are hot burglaries. By contrast, the U.S., with laxer restrictions, has a hot burglary rate of only 13 percent. Consistent with this, surveys of convicted felons in America reveal that they are much more worried about armed victims than they are about running into the police. This fear of potentially armed victims causes American burglars to spend more time than their foreign counterparts casing a house to ensure that nobody is home. Felons frequently comment in these interviews that they avoid late-night burglaries because that s the way to get shot. 13 intruder. John R. Lott, Jr., Now That The Brady Law is Law, You Are Not Any Safer Than Before, Philadelphia Inquirer, Tuesday, 1 Feb. 1994, A9. 10 Clayton E. Cramer and David B. Kopel, Shall Issue : The New Wave of Concealed Handgun Permit Laws, 62 Tenn. L. Rev. 679, 691 (Spring 1995). Expanded version of this paper dated 1994 is available from the Independence Institute, Golden, Colorado. Similarly, Multnomah County, Oregon issued 11,140 permits over the period January 1990 to October 1994 and experienced 5 permit holders being involved in shootings, 3 of which were considered justified by Grand juries. Out of the other two cases, one was fired in a domestic dispute and the other was an accident that occurred while an assault rifle was being unloaded. Bob Barhnhart, Concealed Handgun Licensing in Multnomah County (mimeo Intelligence/Concealed Handgun Unit: Multnomah County, October 1994). 11 Cramer and Kopel, supra note 9, at For example, David B. Kopel, The Samuri, the Mountie, and the Cowboy 155 (1992) and Lott, supra note Wright and Rossi (p. 151) interviewed felony prisoners in ten state correctional systems and found that 56 percent said that criminals would not attack a potential victim that was known to be armed. They also found evidence that criminals in those states with the highest levels of civilian gun ownership worried the most about armed victims. James D. Wright and Peter Rossi, Armed and Considered Dangerous: A survey of Felons and Their Firearms, New York: Adline (1986). Examples of stories where people successfully defend themselves from burglaries with guns are quite common. For example, see Burglar Puts 92-year-old in the Gun Closet and is Shot, New York Times, 7 September 1995, A16. George F. Will, Are We a Nation of Cowards? Newsweek, 15 Nov discusses more generally the benefits produced from an armed citizenry. In his paper on airplane hijacking, William M. Landes references a quote by Archie Bunker from the television show All in the Family that is quite relevant to the current discussion. Landes quotes Archie Bunker as saying Well, I could stop hi-jacking tomorrow...if everyone was allowed to carry guns them hi-jackers wouldn t have no superiority. All you gotta do is arm all

6 4 Chicago Working Paper in Law & Economics The case for concealed handgun use is similar. The use of concealed handguns by some law abiding citizens may create a positive externality for others. By the very nature of these guns being concealed, criminals are unable to tell whether the victim is armed before they strike, thus raising criminals expected costs for committing many types of crimes. Stories of individuals using guns to defend themselves has helped motivate thirty-one states to adopt laws requiring authorities to issue, without discretion, concealed-weapons permits to qualified applicants. 14 This constitutes a dramatic increase from the nine states that allowed concealed weapons in While many studies examine the effects of gun control, 16 and a smaller number of papers specifically address the right-to-carry concealed firearms, 17 these papers involve little more than either time-series or cross-sectional evidence comparing mean crime rates, and none controls for variables that normally concern economists (for example, the probability of arrest and conviction and the length of prison sentences or even variables like personal income). 18 These papers fail to recognize that, since it is frequently only the largest population counties that are very restrictive when local authorities have been given discretion in granting concealed handgun permits, shall issue concealed handgun permit laws, which require permit requests be granted unless the individual has a criminal record or a history of significant mental illness, 19 will not alter the number of permits being issued in all counties. the passengers, then no hi-jacker would risk pullin a rod. William M. Landes, An Economic Study of U.S. Aircraft Hijacking, , 21 J. L. & Econ. 1, (April 1978), Landes 14 These states were Alabama, Alaska, Arizona, Arkansas, Connecticut, Florida, Georgia, Idaho, Indiana, Kentucky, Louisiana, Maine, Mississippi, Montana, Nevada, New Hampshire, North Carolina, North Dakota, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia and Wyoming. 15 These states were Alabama, Connecticut, Indiana, Maine, New Hampshire, North Dakota, South Dakota, Vermont, and Washington. Fourteen other states provided local discretion on whether to issue permits. California, Colorado, Delaware, Hawaii, Iowa, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, New Jersey, New York, Rhode Island and South Carolina. 16 See Gary Kleck, Guns and Violence: An Interpretive Review of the Field, 1 Soc. Path (Jan. 1995) for a survey, 17 For example, P.J. Cook, Stephanie Molliconi, and Thomas B. Cole, Regulating Gun Markets, 86 J. Crim. L & Criminology, (Fall 1995); Cramer and Kopel, supra note 9; David McDowall; Colin Loftin; and Brian Wiersema, Easing Concealed Firearm Laws: Effects on Homicide in Three States, 86 J. Crim. L. & Criminology (Fall 1995); and Gary Kleck and E. Britt Patterson, The Impact of Gun Control and Gun Ownership Levels on Violence Rates, 9 J. Quant. Criminology (1993). 18 All 22 gun control papers studied by Kleck, supra note 15, use either cross-sectional state or city data or use time-series data for the entire US or a particular city. 19 Cramer and Kopel, supra note 9, at

7 Concealed Handguns 5 Other papers suffer from additional weaknesses. The paper by McDowall, et al., 20 which evaluates right-to-carry provisions, was widely cited in the popular press. Yet, their study suffers from many major methodological flaws: for instance, without explanation, they pick only three cities in Florida and one city each in Mississippi and Oregon (despite the provisions involving statewide laws); and they neither use the same sample period nor the same method of picking geographical areas for each of those cities. 21 Our paper hopes to overcome these problems by using annual cross-sectional time-series county level crime data for the entire United States from 1977 to 1992 to investigate the impact of shall issue right-to-carry firearm laws. It is also the first paper to study the questions of deterrence using these data. While many recent studies employ proxies for deterrence such as police expenditures or general levels of imprisonment, we are able to use arrest rates by type of crime, and for a subset of our data also conviction rates and sentence lengths by type of crime. 22 We also attempt to analyze a question noted but not empirically addressed in this literature: the concern over causality between increases in handgun usage and crime rates. Is it higher crime that leads to increased handgun ownership, or the reverse? The issue is more complicated than simply whether carrying concealed firearms reduces murders because there are questions over whether criminals might substitute between different types of crimes as well as the extent to which accidental handgun deaths might increase. II. Problems Testing the Impact of Shall Issue Concealed Handgun Provisions on Crime Starting with Becker (1968), many economists have found evidence broadly consistent with the deterrent effect of punishment. 23 The notion is that the 20 McDowall, et. al., supra note Equally damaging the authors appear to concede in a discussion that follows their piece that their results are highly sensitive to how they define the crimes that they study. Even with their strange sample selection techniques, total murders appear to fall after the passage of concealed weapon laws. Because the authors only examine murders committed with guns, there is no attempt to control for any substitution effects that may occur between different methods of murder. For an excellent discussion of the McDowall et. al. paper see Daniel D. Polsby, Firearms Costs, Firearms Benefits and the Limits of Knowledge, 86 J. Crim. L. & Criminology (Fall 1995). 22 Recent attempts to relate the crime rate to the prison population concern us (see for example, Levitt). Besides difficulties in relating the total prison population with any particular type of crime, we are also troubled by the ability to compare a stock (the prison population) with a flow (the crime rate). Steven Levitt, The Effect of Prison Population Size on Crime Rates: Evidence from Prison Overcrowding Litigation, 144 Q. J. Econ. (1996). 23 For example, Isaac Ehrlich, Participation in Illegitimate Activities: A Theoretical and Empirical Investigation, 81 J. Pol. Econ (1973); Michael K. Block and John Heineke, A Labor Theoretical Analysis of Criminal Choice, 65 Am. Econ. Rev (June 1975); Landes, supra note 13; John R. Lott, Jr., Juvenile Delinquency and Education: A Comparison of Public and

8 6 Chicago Working Paper in Law & Economics expected penalty affects the prospective criminal s desire to commit a crime. This penalty consists of the probabilities of arrest and conviction and the length of the prison sentence. It is reasonable to disentangle the probability of arrest from the probability of conviction since accused individuals appear to suffer large reputational penalties simply from being arrested. 24 Likewise, conviction also imposes many different penalties (for example, lost licenses, lost voting rights, further reductions in earnings, and so on) even if the criminal is never sentenced to prison. 25 While this discussion is well understood, the net effect of shall issue rightto-carry, concealed handguns is ambiguous and remains to be tested when other factors influencing the returns to crime are controlled for. The first difficulty involves the availability of detailed county level data on a variety of crimes over 3054 counties during the period from 1977 to Unfortunately, for the time period we study, the FBI s Uniform Crime Report only includes arrest rate data rather than conviction rates or prison sentences. While we make use of the arrest rate information, we will also use county level dummies, which admittedly constitute a rather imperfect way to control for cross county differences such as differences in expected penalties. Fortunately, however, alternative variables are available to help us proxy for changes in legal regimes that affect the crime rate. One such method is to use another crime category as an exogenous variable that is correlated with the crimes that we are studying, but at the same time is unrelated to the changes in right-to-carry firearm laws. Finally, after telephoning law enforcement officials in all 50 states, we were able to collect time-series county level conviction rates and mean prison sentence lengths for three states (Arizona, Oregon, and Washington). The FBI crime reports include seven categories of crime: murder, rape, aggravated assault, robbery, auto theft, burglary, and larceny. 26 Two additional summary categories were included: violent crimes (including murder, rape, aggravated assault, and robbery) and property crimes (including auto theft, burglary, and larceny). Despite being widely reported measures in the press, these broader categories are somewhat problematic in that all crimes are given Private Provision, 7 Intrl. Rev. L. & Econ (Dec. 1987); James Andreoni, Criminal Deterrence in the Reduce Form: A New Perspective on Ehrlich s Seminal Study, 33 Econ. Inquiry , (July 1995); Morgan O. Reynolds, Crime and Punishment in America (Policy Report 193, National Center for Policy Analysis, June 1995); and Levitt, supra note John R. Lott, Jr., Do We Punish High Income Criminals too Heavily? 30 Econ. Inquiry (Oct. 1992b). 25 John R. Lott, Jr., The Effect of Conviction on the Legitimate Income of Criminals, 34 Econ. Letters (Dec. 1990); John R. Lott, Jr., An Attempt at Measuring the Total Monetary Penalty from Drug Convictions: The Importance of an Individual s Reputation, 21 J. Legal Stud (Jan. 1992); and Lott, supra note Arson was excluded because of a large number of inconsistencies in the data and the small number of counties reporting this measure.

9 Concealed Handguns 7 the same weight (for example, one murder equals one aggravated assault). Even the narrower categories are somewhat broad for our purposes. For example, robbery includes not only street robberies which seem the most likely to be affected by shall issue laws, but also bank robberies where, because of the presence of armed guards, the additional return to having armed citizens would appear to be small. 27 Likewise, larceny involves crimes of stealth, but these range from pick pockets, where shall issue laws could be important, to coin machine theft. 28 This aggregation of crime categories makes it difficult to separate out which crimes might be deterred from increased handgun ownership, and which crimes might be increasing as a result of a substitution effect. Generally, we expect that the crimes most likely to be deterred by concealed handgun laws are those involving direct contact between the victim and the criminal, especially those occurring in a place where victims otherwise would not be allowed to carry firearms. For example, aggravated assault, murder, robbery, and rape seem most likely to fit both conditions, though obviously some of all these crimes can occur in places like residences where the victims could already possess firearms to protect themselves. By contrast, crimes like auto theft seem unlikely to be deterred by gun ownership. While larceny is more debatable, in general to the extent that these crimes actually involve stealth the probability that victims will notice the crime being committed seems low and thus the opportunities to use a gun are relatively rare. The effect on burglary is ambiguous from a theoretical standpoint. It is true that if shall issue laws cause more people to own a gun, the chance of a burglar breaking into a house with an armed resident goes up. However, if some of those who already owned guns now obtain right-to-carry 27 Robbery includes street robbery, commercial robbery, service station robbery, convenience robbery, residence robbery, and bank robbery. (See also the discussion of burglary for why the inclusion of residence robbery creates difficulty with this broad measure.) After we wrote this paper, two different commentators have attempted to argue that If shall issue concealed carrying laws really deter criminals from undertaking street crimes, then it is only reasonable to expect the laws to have an impact on robberies. Robbery takes place between strangers on the street. A high percentage of homicide and rape, on the other hand, occurs inside a home where concealed weapons laws should have no impact. These findings strongly suggest that something else not new concealed carry laws is responsible for the reduction in crime observed by the authors. (Doug Weil, Response to John Lott s Study on the Impact of Carry Concealed Laws on Crime Rates, U.S. Newswire, August 8, 1996.) The curious aspect about the emphasis on robbery over other crimes like murder and rape is that if robbery is the most obvious crime to be effected gun control laws, why have virtually no gun control studies examined robberies? In fact, Kleck s literature survey only notes one previous gun control study that examined the issue of robberies. (See Kleck supra note 15). Yet, given that the FBI includes many categories of robberies besides robberies that take place between strangers on the street, it is not obvious why this should exhibit the greatest sensitivity to concealed handgun laws. 28 Larceny includes pick pockets, purse snatching, shoplifting, bike theft, theft from buildings, theft from coin machines, and theft from motor vehicles.

10 8 Chicago Working Paper in Law & Economics permits, the relative cost of crimes like armed street robbery and certain other types of robberies (where an armed patron may be present) should rise relative to that for burglary. Previous concealed handgun studies that rely on state level data suffer from an important potential problem: they ignore the heterogeneity within states. 29 Our telephone conversations with many law enforcement officials have made it very clear that there was a large variation across counties within a state in terms of how freely gun permits were granted to residents prior to the adoption of shall issue right-to-carry laws. 30 All those we talked to strongly indicated that the most populous counties had previously adopted by far the most restrictive practices on issuing permits. The implication for existing studies is that simply using state level data rather than county data will bias the results against finding any impact from passing right-to-carry provisions. Those counties that were unaffected by the law must be separated out from those counties where the change could be quite dramatic. Even cross-sectional city data 31 will not solve this problem, because without time series data it is impossible to know what impact a change in the law had for a particular city. There are two ways of handling this problem. First, for the national sample, we can see whether the passage of shall issue right-to-carry laws produces systematically different effects between the high and low population counties. Second, for three states, Arizona, Oregon, and Pennsylvania, we have acquired time series data on the number of right-to-carry permits for each county. The normal difficulty with using data on the number of permits involves the question of causality: do more permits make crimes more costly or do higher crimes lead 29 For example, Arnold S. Linsky, Murray A. Strauss, and Ronet Bachman-Prehn, Social Stress, Legitimate Violence, and Gun Availability, (Paper presented at the annual meetings of the Society for the Study of Social Problems, 1988) and Cramer and Kopel, supra note Among those who made this comment to us were: Bob Barnhardt, Manager of the Intelligence/Concealed Handgun Unite of Multinomah County, Oregon; Mike Woodward, with the Oregon Law Enforcement Data System; Joe Vincent with the Washington Department of Licensing Firearms Unit; Alan Krug who provided us with the Pennsylvania Permit data; and Susan Harrell with the Florida Department of State Concealed Weapons Division. Evidence for this point with respect to Virginia is obtained from Eric Lipton, Virginians Get Ready to Conceal Arms; State s New Weapon Law Brings a Flood of Inquiries, The Washington Post A1 (28 June 1995), where it is noted that, Analysts say the new law, which drops the requirement that prospective gun carriers show a demonstrated need to be armed, likely won't make much of a difference in rural areas, where judges have long issued permits to most people who applied for them. But in urban areas such as Northern Virginia where judges granted few permits because few residents could justify a need for them the number of concealed weapon permits issued is expected to soar. In Fairfax, for example, a county of more than 850,000 people, only 10 now have permits. Clayton E. Cramer and David B. Kopel, Shall Issue : The New Wave of Concealed Handgun Permit Laws, 62 Tenn. L. Rev (Spring 1995). Expanded version of this paper dated 1994 is available from the Independence Institute, Golden, Colorado, also raises this point with respect to California. 31 For example, Kleck and Patterson, supra note 16.

11 Concealed Handguns 9 to more permits? The change in the number of permits before and after the change in the state laws allows us to rank the counties on the basis of how restrictive they had actually been in issuing permits prior to the change in the law. Of course there is still the question of why the state concealed handgun law changed, but since we are dealing with county level rather than state level data we benefit from the fact that those counties which had the most restrictive permitting policies were also the most likely to have the new laws exogenously imposed upon them by the rest of their state. Using county level data also has another important advantage in that both crime and arrest rates vary widely within states. In fact, as Table 1 indicates, the standard deviation of both crime and arrest rates across states is almost always smaller than the average within state standard deviation across counties. With the exception of robbery, the standard deviation across states for crime rates ranges from between 61 and 83 percent of the average of the standard deviation within states. (The difference between these two columns with respect to violent crimes arises because robberies make up such a large fraction of the total crimes in this category.) For arrest rates, the numbers are much more dramatic, with the standard deviation across states as small as 15 percent of the average of the standard deviation within states. These results imply that it is no more accurate to view all the counties in the typical state as a homogenous unit than it is to view all the states in the United States as one homogenous unit. For example, when a state s arrest rate rises, it may make a big difference whether that increase is taking place in the most or least crime prone counties. Depending upon which types of counties the changes in arrest rates are occurring in and depending on how sensitive the crime rates are to changes in those particular counties could produce widely differing estimates of how increasing a state s average arrest rate will deter crime. Aggregating these data may thus make it more difficult to discern the true relationship that exists between deterrence and crime. Perhaps the relatively small across-state variation as compared to within-state variations is not so surprising given that states tend to average out differences as they encompass both rural and urban areas. Yet, when coupled with the preceding discussion on how concealed handgun provisions affected different counties in the same state differently, these numbers strongly imply that it is risky to assume that states are homogenous units with respect to either how crimes are punished or how the laws which affect gun usage are changed. Unfortunately, this focus of state level data is pervasive in the entire crime literature, which focuses on state or city level data and fails to recognize the differences between rural and urban counties. However, using county level data has some drawbacks. Frequently, because of the low crime rates in many low population counties, it is quite common to find huge variations in the arrest and conviction rates between years. In addition, our sample indicates that annual conviction rates for some counties are as high as

12 10 Chicago Working Paper in Law & Economics 13 times the offense rate. This anomaly arises for a couple reasons. First, the year in which the offense occurs frequently differs from the year in which the arrests and/or convictions occur. Second, an offense may involve more than one offender. Unfortunately, the FBI data set allows us neither to link the years in which offenses and arrests occurred nor to link offenders with a particular crime. When dealing with counties where only a couple murders occur annually, arrests or convictions can be multiples higher than the number of offenses in a year. This data problem appears especially noticeable for murder and rape. One partial solution is to limit the sample to only counties with large populations. For counties with a large numbers of crimes, these waves have a significantly smoother flow of arrests and convictions relative to offenses. An alternative solution is to take a moving average of the arrest or conviction rates over several years, though this reduces the length of the usable sample period, depending upon how many years are used to compute this average. Furthermore, the moving average solution does nothing to alleviate the effect of multiple suspects being arrested for a single crime. Another concern is that otherwise law abiding citizens may have carried concealed handguns even before it was legal to do so. If shall issue laws do not alter the total number of concealed handguns carried by otherwise law abiding citizens but merely legalizes their previous actions, passing these laws seems unlikely to affect crime rates. The only real effect from making concealed handguns legal could arise from people being more willing to use handguns to defend themselves, though this might also imply that they more likely to make mistakes using these handguns. It is also possible that concealed firearm laws both make individuals safer and increase crime rates at the same time. As Peltzman has pointed out in the context of automobile safety regulations, increasing safety can result in drivers offsetting these gains by taking more risks in how they drive. 32 The same thing is possible with regard to crime. For example, allowing citizens to carry concealed firearms may encourage people to risk entering more dangerous neighborhoods or to begin traveling during times they previously avoided. Thus, since the decision to engage in these riskier activities is a voluntary one, it is possible that society still could be better off even if crime rates were to rise as a result of concealed handgun laws. Finally, there are also the issues of why certain states adopted concealed handgun laws and whether higher offense rates result in lower arrest rates. To the extent that states adopted the law because crime were rising, ordinary least squares estimates would underpredict the drop in crime. Likewise, if the rules were adopted when crimes rates were falling, the bias would be in the opposite direction. None of the previous studies deal with this last type of potential bias. 32 Sam Peltzman, The Effects of Automobile Safety Regulation, 883 J. Pol. Econ (Aug. 1975).

13 Concealed Handguns 11 At least since Ehrlich, 33 economists have also realized that potential biases exist from having the offense rate as both the endogenous variable and as the denominator in determining the arrest rate and because increasing crime rates may lower the arrest if the same resources are being asked to do more work. Fortunately, both these sets of potential biases can be dealt with using two-stage least-squares. III. The Data Between 1977 and 1992, 10 states (Florida (1987), Georgia (1989), Idaho (1990), Maine (1985), 34 Mississippi (1990), Montana (1991), Oregon (1990), Pennsylvania (1989), Virginia (1988), 35 and West Virginia (1989)) adopted shall issue rightto-carry firearm laws. However, Pennsylvania is a special case because Philadelphia was exempted from the state law during our sample period. Nine other states (Alabama, Connecticut, Indiana, Maine, New Hampshire, North Dakota, South Dakota, Vermont, and Washington) effectively had these laws on the books prior to the period being studied. 36 Since the data are at the county level, a dummy variable is set equal to one for each county operating under shall issue right-to-carry laws. A Nexis search was conducted to determine the exact date on which these laws took effect. For the states that adopted the law during the year, the dummy variable for that year is scaled to equal that portion of the year for which the law was in effect. While the number of arrests and offenses for each type of crime in every county from 1977 to 1992 were provided by the Uniform Crime Report, we also contacted the state department of corrections, State Attorney Generals, State Secretary of State, and State Police offices in every state to try to compile data on conviction rates, sentence lengths, and right-to-carry concealed weapons permits by county. The Bureau of Justice Statistics also released a list of contacts in every state that might have available state level criminal justice data. Unfortunately, county data on the total number of outstanding right-to-carry pistol permits 33 Ehrlich, supra note 22 at While we will follow Cramer and Kopel s definition of what constitutes a shall issue or a do issue state, one commentator has suggests that it is not appropriate to include Maine in these categories (Stephen P. Teret, Critical Comments on a Paper by Lott and Mustard, School of Hygiene and Public Health, Johns Hopkins University mimeo, August 7, 1996.) Either defining Maine so that the shall issue dummy equals zero for it or removing Maine from the data set does not alter the findings shown in this paper. Please see footnote 49 for a further discussion. 35 While the intent of the 1988 legislation in Virginia was clearly to institute a shall issue law, the law was not equally implemented in all counties in the state. To deal with this problem, we reran the regressions reported in this paper with the Shall Issue dummy both equal to 1 and 0 for Virginia. The results as reported later in footnote 49 are very similar in the two cases. 36 We rely on Cramer and Kopel, supra note 29, for this list of states. Some states known as do issue states are also included in Cramer and Kopel s list of shall issue states though these authors argue that for all practical purposes these two groups of states are identical.

14 12 Chicago Working Paper in Law & Economics were available for only Arizona, California, Florida, Oregon, Pennsylvania, and Washington, though time series county data before and after a change in the permitting law was only available for Arizona (1994 to 1996), Oregon (1990 to 1992) and Pennsylvania (1986 to 1992). Since the Oregon shall issue law passed in 1990, we attempted to get data on the number of permits in 1989 by calling up every county sheriff in Oregon, with 25 of the 36 counties providing us with this information. (The remaining counties claimed that records had not been kept.) 37 For Oregon, data on the county level conviction rate and prison sentence length was also available from 1977 to One difficulty with the sentence length data is that Oregon passed a sentencing reform act that went into effect in November 1989 causing criminals to serve 85 percent of their sentence, and thus judges may have correspondingly altered their rulings. Even then, this change was phased in over time because the law only applied to crimes that took place after it went into effect in In addition, the Oregon system did not keep complete records prior to 1987, and the completeness of these records decreased the further into the past one went. One solution to both of these problems is to interact the prison sentence length with year dummy variables. A similar problem exists for Arizona which adopted a truth-in-sentencing reform during the fall of Finally, Arizona is different from Oregon and Pennsylvania in that it already allowed handguns to be carried openly before passing its concealed handgun law, thus one might expect to find a somewhat smaller response to adopting a concealed handgun law. In addition to using county dummy variables, other data were collected from the Bureau of the Census to try controlling for other demographic characteristics that might determine the crime rate. These data included information on the population density per square mile, total county population, and detailed information on the racial and age breakdown of the county (percent of population by each racial group and by sex between 10 and 19 years of age, between 20 and 29, between 30 and 39, between 40 and 49, between 50 and 64, and 65 and over). 38 While a large literature discusses the likelihood of younger males engaging in crime, 39 controlling for these other categories allows us to also attempt to measure the size of the groups considered most vulnerable (for example, females in the case of rape). 40 Recent evidence by Glaeser and 37 The Oregon counties providing permit data were Benton, Clackamas, Coos, Curry, Deschutes, Douglas, Gilliam, Hood River, Jackson, Jefferson, Josephine, Klamath, Lane, Linn, Malheur, Marion, Morrow, Multnomah, Polk, Tillamook, Washington and Yamhill. 38 See Table 2 for the list and summary statistics. 39 For example, James Q. Wilson and Richard J. Herrnstein, Crime and Human Nature, New York: Simon and Schuster (1985) at However, the effect of an unusually large percentage of young males in the population may be mitigated because those most vulnerable to crime may be more likely to take actions to protect themselves. Depending upon how responsive victims are to these threats, it is possible that the

15 Concealed Handguns 13 Sacerdote confirms the higher crime rates experienced in cities and examines to what extent this arises due to social and family influences as well as the changing pecuniary benefits from crime, 41 though this is the first paper to explicitly control for population density. The data appendix provides a more complete discussion of the data. An additional set of income data was also used. These included real per capita personal income, real per capita unemployment insurance payments, real per capita income maintenance payments, and real per capita retirement payments per person over 65 years of age. 42 Including unemployment insurance and income maintenance payments from the Commerce Department s Regional Economic Information System (REIS) data set were attempts to provide annual county level measures of unemployment and the distribution of income. Finally, we recognize that other legal changes in how guns are used and when they can be obtained can alter the levels of crime. For example, penalties involving improper gun use might also have been changing simultaneously with changes in the permitting requirements for concealed handguns. In order to see whether this might confound our ability to infer what was responsible for any observed changes in crimes rates we read through various editions of the Bureau of Alcohol, Tobacco, and Firearms State Laws and Published Ordinances - Firearms (1976, 1986, 1989, and 1994). Excluding the laws regarding machine guns and sawed-off shotguns, there is no evidence that the laws involving the use of guns changed significantly when concealed permit rules were changed. 43 Another coefficient for a variable like the percent of young males in the population could be zero even when the group in question poses a large criminal threat. 41 Edward L. Glaeser and Bruce Sacerdote, Why is There More Crime in Cities? (Working Paper, Harv. U., 14 Nov. 1995). 42 For a discussion of the relationship between income and crime see John R. Lott, Jr., A Transaction-Costs Explanation for Why the Poor are More Likely to Commit Crime, 19 J. Legal Stud., (Jan. 1990). 43 A more detailed survey of the state laws is available from the authors, a brief survey of the laws excluding the permitting changes finds: Alabama: No significant changes in these laws during period. Connecticut: Law gradually changed in wording from criminal use to criminal possession from 1986 to Florida: Has the most extensive description of penalties. The same basic law ( ) is found throughout the years. An additional law (790.07) is found only in Georgia: A law ( ) that does not appear in the 1986 edition appears in the 1989 and 1994 issues. The law involves possession of a firearm during commission of a crime and specifies the penalties associated with it. Because of the possibility that this legal change might have occurred at the same time as the 198 changes in permitting rules, we used a Lexis search to check the legislative history of and found that the laws were last changed in 1987, two years before the change in permitting rules (1996)). Idaho: There are no significant changes in Idaho over time. Indiana: No significant changes in these laws during period. Maine: No significant changes in these laws during period. Mississippi: Law talks explicitly about penalties. It appears in the 1986 version, but not in the 1989 or the 1994 versions. Montana: Some changes in punishments related to unauthorized carrying of concealed weapons laws, but no changes in the punishment for using a weapon in a crime. New Hampshire: No

16 14 Chicago Working Paper in Law & Economics survey which addresses the somewhat boarder question of sentencing enhancement laws for felonies committed with deadly weapons (firearms, explosives, and knives) from 1970 to 1992 also confirms this general finding with all but four of the legal changes clustered from 1970 to Yet, controlling for the dates supplied by Marvell and Moody still allows us to examine the deterrence effect of criminal penalties specifically targeted at the use of deadly weapons during this earlier period. 45 States also differ in terms of their required waiting periods for handgun purchases. Again using the Bureau of Alcohol, Tobacco, and Firearms State Laws and Published Ordinances - Firearms, we identified states with waiting periods and did a Lexis search on those ordinances to determine exactly when those laws went into effect. Thirteen of the nineteen states with waiting periods had them prior to the beginning of our sample period. 46 IV. The Empirical Evidence A. Using County Data for the United States The first group of regressions reported in Table 3 attempt to explain the natural log of the crime rate for nine different categories of crime. The regressions are run using weighted ordinary least squares. While we are primarily interested in a dummy variable to represent whether a state has a significant changes in these laws during period. North Dakota: No significant changes in these laws during period. Oregon: No significant changes in these laws during period. Pennsylvania: No significant changes in these laws during period. South Dakota: Law , which specifies penalties for commission of a felony while armed appears in 1986, but not Vermont: Section 4005, which outlines the penalties for carrying a gun when committing a felony, appears in 1986, but not in 1989 or Virginia: No significant changes in these laws during period. Washington: No significant changes in these laws during period. West Virginia: Law is on the books in 1994, but not the earlier versions. It involves punishment for endangerment with firearms. Removing Georgia from the sample, which was the only state that had gun laws changing near the year that the Shall Issue law went into affect, so that there is no chance that the other changes in guns laws might effect our results does not appreciably alter our results. 44 Thomas B. Marvell and Carlisle E. Moody, The Impact of Enhanced Prison Terms for Felonies Committed with Guns, 33 Criminology 247, (May 1995). 45 Using Marvell and Moody s findings show that the closest time period between these sentencing enhancements and changes in concealed weapon laws is 7 years (Pennsylvania). Twenty-six states passed their enhancement laws prior to the beginning of our sample period and only four states passed these types of laws after Maine which implemented its concealed handgun law in 1985 passed its sentencing enhancement laws in The states with a waiting period prior to the beginning of our sample included: Alabama, California, Connecticut, Illinois, Maryland, Minnesota, New Jersey, North Carolina, Pennsylvania, Rhode Island, South Dakota, Washington, and Wisconsin. The District of Columbia also had a waiting period prior to the beginning of our sample. The states which adopted this rule during the sample include: Hawaii, Indiana, Iowa, Missouri, Oregon, and Virginia.

17 Concealed Handguns 15 shall issue law, we also control for each type of crime s the arrest rate, demographic differences, and dummies for the fixed effects for years and counties. The results imply that shall issue laws coincide with fewer murders, rapes, aggravated assaults, and rapes. 47 On the other hand, auto theft and larceny rates rise. Both changes are consistent with our discussion on the direct and substitution effects produced by concealed weapons. 48 Rerunning these specifications with only the shall issue dummy, the shall issue dummy and the arrest rates, or simply just the shall issue dummy and the fixed year effects produces even more significant effects for the shall issue dummy One possible concern with these initial results raises from our use of an aggregate public policy variable (state right-to-carry laws) on county level data. See Bruce C. Greenwald, A General Analysis of the Bias in the Estimated Standard Errors of Least Squares Coefficients, 22 J. Econometrics (Aug. 1983); and Brent R. Moulton, An Illustration of a Pitfall in Estimating the Effects of Aggregate Variables on Micro Units, 72 Rev. Econ. & Stat. 334 (1990). As Moulton writes: If disturbances are correlated within the groupings that are used to merge aggregate with micro data, however, then even small levels of correlation can cause the standard errors from the ordinary least squares (OLS) to be seriously biased downward. Yet, this should not really be a concern here because of our use of dummy variables for all the counties, which is equivalent to using state dummies as well as county dummies for all but one of the counties within each state. Using these dummy variables thus allow us to control for any disturbances that are correlated within any individual state. The regressions discussed in footnote 53 rerun the specifications shown in Table 3 but also include state dummies that are interacted with a time trend. This should thus not only control for any disturbances that are correlated with the states, but also for any disturbances that are correlated within a state over time. Finally, while right-tocarry laws are almost always statewide laws, there is one exception. Pennsylvania exempted it largest county (Philadelphia) from the law when it was passed in 1989, and it remained exempt from the law during the rest of the sample period. 48 However, the increase in the number of property crimes is larger than the drop in the number of robberies. 49 While we strongly believe that the arrest rate is important in determining the crime rate, one concern with the results reported in the tables is whether the relationship between the Shall Issue dummy and the crime rates still occurs even when all the other variables are not controlled for. Using weighted least squares and reporting only the Shall Issue coefficients, we estimated the following regression coefficients (absolute t-statistics are shown in parentheses). Endogenous Shall Issue Dummy Shall Issue Dummy Variables Only and Year Effects Only ln(violent crimes) (23.558) (30.110) ln(murder) (19.854) (20.290) ln(rape) (0.843) (2.045) ln(aggravated Assault) (21.858) (30.170) ln(robbery) (20.382) (22.654) ln(property Crime) (18.223) (20.535) ln(auto Theft) (12.676) (23.505) ln(burglary) (25.998) (22.189) ln(larceny) (10.752) (13.953)

18 16 Chicago Working Paper in Law & Economics The results are large empirically. When state concealed handgun laws went into effect in a county, murders fell by 8.5 percent, and rapes and aggravated assaults fell by 5 and 7 percent. 50 In 1992, there were 18,469 murders; 79,272 rapes; 538,368 robberies; and 861,103 aggravated assaults in counties without shall issue laws. The coefficients imply that if these counties had been subject to state concealed handgun laws, murders in the United States would have declined by 1,570. Given the concern that has been raised about increased accidental deaths from concealed weapons, it is interesting to note that the entire number of accidental gun deaths in the United States in 1992 was 1,409. Of this total, 546 accidental deaths were in states with concealed handgun laws and 863 were in those without these laws. The reduction in murders is as much as three times greater than the total number of accidental deaths in concealed handgun states. Thus, if our results are accurate, the net effect of allowing concealed handguns is clearly to save lives. Similarly, the results indicate that the number of rapes in states without shall issue laws would have declined by 4,177; aggravated assaults by 60,363; and robberies by 11, The other estimates discussed in the text produce similar results and are available upon request from the authors. 50 While we adopt the classifications used by Cramer and Kopel (supra at note 9), some are more convinced by other classifications of state (for example, Weil at supra note 26 and Teret at supra note 33). Setting the Shall Issue dummy for Maine to zero and rerunning the regressions shown in Table 3 results in the Shall Issue coefficient equaling (t-statistics in parentheses): (2.955) for violent crimes, (5.071) for murder, (4.622) for rape, (3.838) for aggravated assault, (0.714) for robbery,.029 (3.939) for property crimes,.081 (6.942) for automobile theft,.0036 (0.466) for burglary, and.0344 (3.790) for larceny. Similarly, setting the Shall Issue dummy for Virginia to zero results in the Shall Issue coefficient equaling (tstatistics in parentheses): (3.775) for violent crimes, (5.138) for murder, (4.007) for rape, (4.410) for aggravated assault, (0.076) for robbery,.0334 (4.326) for property crimes,.091 (7.373) for automobile theft,.0211 (2.591) for burglary, and.0348 (3.646) for larceny. As a final test, dropping both Maine and Virginia from the data set results in the Shall Issue coefficient equaling (t-statistics in parentheses): (2.117) for violent crimes, (5.519) for murder, (4.589) for rape, (2.436) for aggravated assault, (0.400) for robbery,.0361 (4.436) for property crimes,.0977 (7.607) for automobile theft,.0216 (2.526) for burglary, and (3.707) for larceny. 51 Given the possible relationship between drug prices and crime, we reran the regressions in Table 3 by including an additional variable for cocaine prices. One argument linking drug prices and crime is that if the demand for drugs is inelastic and if people commit crimes in order to finance their habits, higher drug prices might lead to increased levels of crime. Using the Drug Enforcement Administration s STRIDE data set from 1977 to 1992 (with the exceptions of 1988 and 1989), Michael Grossman, Frank J. Chaloupka, and Charles C. Brown estimate the price of cocaine as a function of its purity, weight, year dummies, year dummies interacted with eight regional dummies, and individual city dummies. The Demand for Cocaine by Young Adults: A Rational Addiction Approach, (Working Paper, NBER July 1996). There are two problems with this measure of predicted prices: 1) it removes observations during a couple of important years during which changes were occurring in concealed handgun laws and 2) the predicted values that we obtained from this ignored the city level observations. The reduced number of observations provides an important reason why we do not include this variable in the regressions

19 Concealed Handguns 17 On the other hand, property crime rates definitely increased after shall issue laws were implemented. The results are equally dramatic. If states without concealed handgun laws had passed such laws, there would have been 247,165 more property crimes in 1992 (a 2.7 percent increase). Thus, criminals respond substantially to the threat of being shot by instead substituting into less risky crimes. 52 A recent National Institute of Justice study 53 provides estimates the costs of different types of crime based upon lost productivity; out-of-pocket expenses such as medical bills and property losses; and losses for fear, pain, suffering, and lost quality of life. While there are questions about using jury awards to measure losses such as fear, pain, suffering, and lost quality of life, the estimates provide us one method of comparing the reduction in violent crimes with the increase in property crimes. Using the numbers from Table 3, the estimated gain from allowing concealed handguns is over $6.214 billion in 1992 dollars. The reduction in violent crimes represents a gain of $6.6 billion ($4.75 billion from murder, $1.4 billion from aggravated assault, $374 million from rape, and $98 million from robbery), while the increase in property crimes represents a loss of $417 million ($342 million from auto theft, $73 million from larceny, and $1.5 million from burglary). However, while $6.2 billion is substantial, to put it into perspective, it equals only about 1.33 percent of the total aggregate losses from these crime categories. These estimates are probably most sensitive to the value of life used (in the Miller et al. study this was set at $1.84 million in 1992 dollars). Higher estimated values of life will increase the net gains from concealed handgun use, while lower values of life will reduce the gains. 54 To the extent that people are shown in Table 3. However, the primary impact of including this new variable is to make the shall issue coefficients in the violent crime regressions even more negative and more significant (e.g., the coefficient for the violent crime regression is now -.075, -.10 for the murder regression, for rape, and -.11 for aggravated assault, with all of them significant at more than the.01 level). Only for the burglary regression does the shall issue coefficient change appreciably: it is now negative and insignificant. The variable for drug prices itself is negatively related to murders and rapes and positively and significantly related at least at the.01 level for a one-tailed t-test to all the other categories of crime. We would like to thank Michael Grossman for providing us with the original regressions on drug prices from his paper. 52 By contrast, if the question had instead been what would the difference in crime rates have been between either have all states or no states adopting right-to-carry handgun, the case of all states adopting concealed handgun laws would have produced 2,020 fewer murders; 5,747 fewer rapes; 79,001 fewer aggravated assaults; and 14,862 fewer robberies. By contrast, property crimes would have risen by 336, Ted R. Miller; Mark A. Cohen; and Brian Wiersema, Victim Costs and Consequences: A New Look, National Institute of Justice: Washington, D.C. (Feb. 1996). 54 We reran the specifications shown in Table 3 by also including state dummies which were each interacted with a time trend variable. In this case, all of the concealed handgun dummies were negative, though the coefficients were not statistically significant for aggravated assault and larceny. Under this specification, adopting concealed handgun laws in those states currently without them would have reduced 1992 murders by 1,839; rapes by 3,727; aggravated assaults by

20 18 Chicago Working Paper in Law & Economics taking greater risks towards crime because of any increased safety produced by concealed handgun laws, 55 these numbers will underestimate the total savings from concealed handguns. The arrest rate produces the most consistent effect on crime. Higher arrest rates imply lower crime rates for all categories of crime. A one standard deviation change in the probability of arrest accounts for 3 to 17 percent of a one standard deviation change in the various crime rates. The crime most responsive to arrest rates is burglary (11 percent), followed by property crimes (10 percent); aggravated assault and violent crimes more generally (9 percent); murder (7 percent); rape, robbery, and larceny (4 percent); and auto theft (both 3 percent). For property crimes, a one standard deviation change in the percent of the population that is black, male, and between 10 and 19 years of age explains 22 percent of these crime rates. For violent crimes, the same number is 5 percent. Other patterns also show up in the data. For example, more black females between the ages of 20 and 39, more white females between the ages of 10 and 39 and those over 65, and other race females between 20 and 29 are positively and significantly associated with a greater number of rapes occurring. Population density appears to be most important in explaining robbery, burglary, and auto theft rates, with a one standard deviation change in population density being able to explain 36 percent of a one standard deviation change in auto theft. Perhaps most surprising is the relatively small, even if frequently significant, effect of income on crime rates. A one standard deviation change in real per capita income explains no more than 4 percent of a one standard deviation change in crime and in seven of the specifications it explains 2 percent or less of the change. If the race, sex, and age variables are replaced with variables showing the percent of the population that is black and the percent that is white, 50 percent of a standard deviation in the murder rate is explained by the percent of the population that is black. Given the high rates that blacks are arrested and incarcerated or are victims of crimes, this is not unexpected. Given the wide use of state level crime data by economists and the large within state heterogeneity shown in Table 1, Table 4 provides a comparison by reestimating the specifications reported in Table 3 using state level rather than county level data. The only other difference in the specification is the replacement of county dummies with state dummies. While the results in these 10,990; robberies by 61,064; burglaries by 112,665; larcenies by 93,274; and auto thefts by 41,512. The total value of this reduction in crime in 1992 dollars would have been $7.02 billion. With the exceptions of aggravated assault and burglary, violent crimes still experienced larger drops from the adoption of concealed handgun laws than did property crimes. Rerunning the specifications in Table 3 without either the percentage of the populations that fall into the different sex, race, and age categories or without the measures of income tended to produce similar though somewhat more significant results with respect to concealed handgun laws. The estimated gains from passing concealed handgun laws were also larger. 55 Again see Peltzman, supra note 31.

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